18-07-2012, 01:04 PM
DAMS
Dams.ppt (Size: 598 KB / Downloads: 232)
Uplift
the water under pressure that comes b/t dam and foundation and results
in upward (uplift) forces against the dam
h1 = depth of water @ upstream face, aka “heel” (higher)
h2 = depth of water@ downstream face, aka “toe” (lower)
= specific weight of water
t = base thickness of dam
ARCH DAMS
Curved dam which is dependent upon arch action for its strength.
Transmits most of horizontal water thrust behind them to the abutments by the arch action.
Thinner and requires less material than any other type of dam.
Used only in narrow canyons.
BUTTRESS DAMS
Buttress dams are dams in which the face is held up by a series of supports.
Buttress dams can take many forms -- the face may be flat or curved.
Usually, buttress dams are made of concrete and may be reinforced with steel bars.
EMBANKMENT DAMS
Generally have some sort of water proof insides (called the core), which is covered with earth or rock fill. Water will seep in through the earth or rock fill, but should not seep into the core. The water will seep into the core material and should stop at the seepage line.